SUBSEA POWER COMPONENTS

Transcription

1 SUBSEA POWER COMPONENTS 20,0 18,0 Installed motor shaft power Accumulated 2011 ~70 MW 16,0 14,0 12,0 MW 10,0 8,0 6,0 PAZFLOR 4,0 2,0 0,0 LUFENG TROLL TORDIS TYRIHANS

2 Most common power supply systems HV grid 50/60 Hz Input transformer App 7 kv Hz M Topside Subsea M Topside Subsea kv M Most (all so far) motors for subsea processing require variable speed drive () due to uncertainty in reservoir data, especially over the field s life time Subsea Power Supply Systems Topside s - AC Subsea Distribution - AC Subsea Distribution DC? AC/DC Topside Subsea Switchgear DC/VAC Motor M M M Motor M M M Motor M M M AC: Alternating Current DC: Direct Current

3 Subsea Power Supply Systems continued Subsea Distribution - LFAC AC/LFAC 16 2/3 Hz Large transformers! Switchgear Studies suggest 50 MW/600 km LFAC is feasible Motor M M M AC: Alternating Current DC: Direct Current LF: Low Frequency Typical subsea power supply string Power cable Motor penetrator Penetrator/ Dry mate connector Wet mate connector Pump/motor

4 Typical pump station layout (2 pumps) Electrical Motor Subsea Electrical Connectors Power Jumper 11 x 6.2 x 7.7 m 125 tons Typical Pump/Motor unit liquid cooled Shaft power rating : kw Rated voltage 6600 V App. 50 units installed App. 1.5 mill running hrs accumulated Installed in water depths up to 1800 m Liquid: mineral oil or water/glycol mix Permanent magnet motor under qualification (3 MW) Need for larger pump motors identified by several operators: 5-6 MW XLPE cable wound stator for water/glycol barrier fluid

5 Subsea Gas Compression Statoil motor qualification programs Ormen Lange Gas cooled 12.5 MW 6600 V rpm Åsgard Gas cooled 8 MW 6200 V rpm Gullfaks 2030 Oil cooled 2 x 2.5 MW 6600 V 2 x 4500 rpm Pump motor kw PM rotor Canned CONNECTORS AND PENETRATORS Normally three main classifications: DRY MATE CONNECTOR WET MATE CONNECTOR PENETRATOR For connection in dry/controlled environment Available with higher electrical rating (voltage) For subsea connection Protection caps normally required when unmated Equipment bushing Available with high differential pressure rating and/or high electrical rating (voltage) DMEC PEN WMEC PEN

6 TYPICAL SUBSEA POWER JUMPER ARRANGEMENT TYPICAL PUMP CONNECTOR ASSEMBLY FEMALE MALE

7 Subsea Typical layout Oil filled/pressure compensated Double sealing philosophy Natural cooling Minimum instrumentation 13 units in service 750 kva 10.5/3.5 kv 1600 kva 11/1 kv 85 Hz Tyrihans: 2 x 4000 kva 22/6.9 kv 67.5 Hz UMBILICAL TRANSFORMER MODULE OUTER TANK INNER TANK Subsea ongoing qualifications Ormen Lange (Operator: Shell) 20/20 MVA 120/22 kv (Main transf) - Pilot 15 MVA 22/3.7/3.7 kv (Compr transf) 750 kva 22/2.85 kv (Pump transf) Åsgard MF 15 MVA 38.25/6.2 kv 200 Hz Tyrihans Jack St Malo (Operator: Chevron) 5 MVA, 22/ 6.6 kv 67 Hz * Operated by Shell Ormen Lange

8 Subsea testing Electrical tests IEC Thermal tests Component pressure tests Welding qualifications Vacuum test of housing Compatibility tests Compensator endurance tests SUBSEA Variable Speed Drive () Qualified (but..) Qualification ongoing SEPDIS module (ABB/Framo/GE) Power: 3.5 MVA Voltage: 3 kv Passive cooling Atmospheric enclosure Ormen Lange modules (Converteam/Aker) Power: 12.5 / 0.4 MW Voltage: 6.6 / 2.5 kv Forced cooling Atmospheric enclosure Siemens power grid Power: 6 MVA Voltage: 6.6 kv Passive cooling Pressure compensated

9 SUBSEA SWITCHGEAR (Circuit Breaker) Qualification ongoing GE Vetco Gray 24 kv Oil filled, pressure compensated base Atmospheric breaker chamber 2000 m water depth Shallow water tested Ormen Lange CB module 36 kv Atmospheric enclosure Incl. UPS power supply Incl. LV distribution Incl. pre-charge system 900 m water depth Current rating limited by penetrators/connectors! Siemens power grid SWG 36 kv Oil filled, pressure compensated base Atmospheric breaker chamber (2 CB s/chamber) 3000 m water depth Thank you Subsea Power Components Steinar Midttveit Leading Advisor, Subsea Electrical Technology stmid@statoil.com, tel: